Cube (k?b), n. [F. cube, L. cubus, fr. Gr. ���� a cube, a cubical die.] 1. (Geom.) A regular solid body, with six equal square sides.
2. (Math.) The product obtained by taking a number or quantity three times as a factor; as, 4x4=16, and 16x4=64, the cube of 4.
Cube ore(Min.), pharmacosiderite. It commonly crystallizes in cubes of a green color. — Cube root. (Math.), the number or quantity which, multiplied into itself, and then into the product, produces the given cube; thus, 3 is the cube root of 27, for 3x3x3 = 27. — Cube spar(Min.), anhydrite; anhydrous calcium sulphate.